function getPosTop(i,j){
	return 20 + i*120;
}

function getPosLeft(i,j){
	return 20 + j*120;
}

function getNumberBackGroundColor(number){
	switch(number){
		case 2: return "#eee4da";break;
		case 4: return "#ede0c8";break;
		case 8: return "#f2b179";break;
		case 16: return "#f59563";break;
		case 32: return "#f67c5f";break;
		case 64: return "#f65e3b";break;
		case 128: return "#edcf72";break;
		case 256: return "#edcc61";break;
		case 512: return "#9c0";break;
		case 1024: return "#33b5e5";break;
		case 2048: return "#09c";break;
		case 4096: return "#a6c";break;	
		case 8192: return "#93c";break;
	}
	return "black";
}

function getNumberColor(number){
	if(number <=4){
		return "#77e65";
	}
	return "white";
}

function nospace(board){
	
	for (var i = 0 ;i <4; i++) {
		for (var j = 0; j<4; j++) {
			if(board[i][j] == 0 ){
				return false;
			}
		}
		
	}
	return true;
}

function canMoveLeft(board){
	for (var i=0; i <4;i++) {
		for(var j = 1 ;j<4 ; j++){
			if(board[i] [j] !=0){
				if(board[i] [j-1]==0 || board[i][j-1] == board[i][j]){
					return true;
				}
			}
		}
		
	}
	return false;
}

function canMoveRight( board ){

    for( var i = 0 ; i < 4 ; i ++ ){
        for( var j = 2; j >= 0 ; j -- ){
            if( board[i][j] != 0 ){
                if( board[i][j+1] == 0 || board[i][j+1] == board[i][j] ){
                	return true;           
          	    }   	
            }
        }            
	}
    return false;
}

function canMoveUp( board ){

    for( var j = 0 ; j < 4 ; j ++ ){
        for( var i = 1 ; i < 4 ; i ++ ){
            if( board[i][j] != 0 ){
                if( board[i-1][j] == 0 || board[i-1][j] == board[i][j] ){
                    return true;
				}	
            }
        }
        
    }
    return false;
}

function canMoveDown( board ){

    for( var j = 0 ; j < 4 ; j ++ ){
        for( var i = 2 ; i >= 0 ; i -- ){
            if( board[i][j] != 0 ){
                if( board[i+1][j] == 0 || board[i+1][j] == board[i][j] ){
                    return true;
				}	
            }
        }
        
    }
    return false;
}

function noBlockHorizontal(row, col1 , col2, board){
	for (var  i = col1 +1 ; i <col2; i ++) {
		if(board[row][i] != 0 ){
			return false;
		}
	}
	return true;
}

function noBlockVertical( col , row1 , row2 , board ){
    for( var i = row1 + 1 ; i < row2 ; i ++ ){
        if( board[i][col] != 0 ){
     		return false;
    	}
   	}   
    return true;
}

function nomove(board){
	if(	canMoveLeft(board) ||
		canMoveRight(board) ||
		canMoveUp(board) ||
		canMoveDown(board)){
		return false;
	}
	return true;
}
